Electric-arc



(No Model.)

E. J. HOUSTON.-

\ ELECTRIC ARG LAMP.

No. 307,769. Patented Nov. 11, 1884.

IIIIIIIIIHI Envia nt Q 1m y zu; l

llnrrnn trarre Partnr Ori-iron.

EDVIN J. HOUSTON, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE THOMSON-HOUSTON ELECTRIC COMPANY, OF CONNECTICUT.

ELECTRIC-JAR() LAMP.

SPECIFICATION forming part of Letters Patent No. 307,769, dated November11. 1884.

Application filed May 4, 1,883. (No model.)

To all whom, t may concerti/1,:

Be it known that I, EDWIN J. HOUSTON, a citizen of the United States,and a resident of 'Philadelphia in the county of Philadelphia and Stateof Pennsylvania, have invented certain new and useful Improvements inElectric Lamps, of which the following is a specification.

My invention relates to a novel construction ofthe frames for electriclamps, whereby the insertion and adjustment of the upper and lowercarbons in such lamps are greatly facilitated.

In placing the carbous in the carbon-holders of an electric lampprovided with a glass globe difficulty is experienced in adjusting thecarbons in line with each other, especially if the globe is furnishedwith a top or cover.

Tile object of my invention is to avoid this difficulty in electriclamps; and to this end my invention consists of' a lamp-frame of noveland simple construction, the peculiarities of which will be hereinafterdescribed, and then speciiied in the claims.

Figure l is an elevation of a lamp-frame constructed according to myinvention. Fig. 2 is a view of' the frame, looking upward, andillustrating the position ofthe parts when the cross-bar is swung to oneside to throw the carbons out of' line. Fig. 3 is a side View, and Fig.-Lt an edge view, of' a modified form ofthe invention.

In Fig. l, A illustrates the glass globe, mounted upon and securelyfastened in any approved manner to the lower connecting picce, B, towhich, also, the lower carbon and carbon-holder, with. propel'electrical connections, are attached. rihis connecting-piece B, which isusually a continuation of the Vertical arms C C, or, if' made separate,is rigidly attached thereto, is made movable in this instance byproviding a swivel-point, hinge, pivot, or joint-sueh as shown at D- insuch a manner that the lower1 piece, B, with its appendages, may beturned outward in a horizontal plane into the position shown in Fig. 2of the drawings. Half a revolution allows sufficient space to inserteither carbon without interference with or from the other. The

other end of the connecting-piece B is provided with a clamp-screw, E,to secure it to the arm C, when necessary. 1

Suitable locking devices-such as springcatch F--may be employed inaddition to the clamp-screw E, in order to guard against accidentalunlocking of the latter. In order to stiften and strengthen the lowerends of both arms C C2, a semicircular brace-bar, Cr, is provided, whichunites both arms in such a manner as to permit the connecting-piece B topartly overlap the same when in its proper position, and to serve as auadditional support to the latter.

In the modification shown in Figs. 3 andt the lower connecting-piece, B,is pi voted at M and N to the ends of' the vertical arms C C2, so thatit may be revolved in a vertical plane. A quarter of a revolution, asshown in Fig. 4 in dotted lines, is sufficient to remove theconnccting-piece B and its appurtenances out of 7o line with the uppercarbon. The extent of' this motion is limited by suitable stops. (Shownat O O2.) A set-screw, P, serves to hold the piece B in any desiredposition in which it is placed, and any locking device-such asspring-catch Q-may be provided as an additional guard against accidentaldisplacement of the lower carbon.

Vhat I claim as my invention isl. The combination, in an electric-arclamp, of the side rods, C C, and a pivoted cross-bar, B, carrying theglobe that protects the arc, as and for the purpose described.

2. The combination, in an electric-lamp frame, of the side bars, CC, thepermanent strengthening cross piece or bar G, and the jointed or hingedcross-bar B, as and for the purpose described.

3. rIhe combination, in an electric-lamp frame, of the side bars, C C2,the lower crosspiecc, B, uniting said bars and hinged to swing in aplane at right angles to them, as and for the purpose described.

Signed at Philadelphia, in the county of' Philadelphia and Stat-e ofPennsylvania, this '7th day of April, A. D. 1883.

EDVIN J. HOUSTON.

TV1 t nesses C. Hownnn CoLKn'r, EDWIN S. Knnnnn..

